Great things are not accomplished overnight; great deeds take a long time. - A proverb. * /A takes a long time to write a successful novel, but don't worry; Rome wasn't built in a day, as the saying goes./
ROME WASN'T BUILT IN A DAY
Meaning of ROME WASN'T BUILT IN A DAY in English
Slang English vocab. Английский сленговый словарь. 2012